ENGR00309915 [torvalds#1087] enhanced video memory mutex

this patch can fix NULL pointer issue in GPU kernel driver with the following log

[<7f240438>] (gckEVENT_AddList+0x0/0x810 [galcore]) from [<7f239ebc>] (gckCOMMAND_Commit+0xf28/0x118c [galcore])
[<7f238f94>] (gckCOMMAND_Commit+0x0/0x118c [galcore]) from [<7f2362dc>] (gckKERNEL_Dispatch+0x120c/0x24e4 [galcore])
[<7f2350d0>] (gckKERNEL_Dispatch+0x0/0x24e4 [galcore]) from [<7f222280>] (drv_ioctl+0x390/0x540 [galcore])
[<7f221ef0>] (drv_ioctl+0x0/0x540 [galcore]) from [<800facd0>] (vfs_ioctl+0x30/0x44)

The false code is at 0x217bc where the 0-pointer happens (r3 = 0)

gcuVIDMEM_NODE_PTR node = (gcuVIDMEM_NODE_PTR)(gcmUINT64_TO_PTR(Record->info.u.FreeVideoMemory.node));
   217b8:                e5953028             ldr           r3, [r5, torvalds#40]         ; 0x28

                if (node->VidMem.memory->object.type == gcvOBJ_VIDMEM)
   217bc:                e5932000             ldr           r2, [r3]
   217c0:                e5922000             ldr           r2, [r2]
   217c4:                e152000a             cmp       r2, sl
                {
                     gcmkVERIFY_OK(gckKERNEL_RemoveProcessDB(Event->kernel,

Date: Apr 23, 2014
Signed-off-by: Xianzhong <[email protected]>
Acked-by: Jason Liu

Author: Xianzhong

drivers/mxc/gpu-viv/hal/kernel/gc_hal_kernel.c

@@ -165,6 +165,8 @@ gckKERNEL_Construct(
     kernel->dvfs         = gcvNULL;
 #endif
 
+    kernel->vidmemMutex  = gcvNULL;
+
     /* Initialize the gckKERNEL object. */
     kernel->object.type = gcvOBJ_KERNEL;
     kernel->os          = Os;
@@ -297,6 +299,9 @@ gckKERNEL_Construct(
     gcmkONERROR(gckOS_CreateSyncTimeline(Os, &kernel->timeline));
 #endif
 
+    /* Construct a video memory mutex. */
+    gcmkONERROR(gckOS_CreateMutex(Os, &kernel->vidmemMutex));
+
     /* Return pointer to the gckKERNEL object. */
     *Kernel = kernel;
 
@@ -518,6 +523,8 @@ gckKERNEL_Destroy(
     gcmkVERIFY_OK(gckOS_DestroySyncTimeline(Kernel->os, Kernel->timeline));
 #endif
 
+    gcmkVERIFY_OK(gckOS_DeleteMutex(Kernel->os, Kernel->vidmemMutex));
+
     /* Mark the gckKERNEL object as unknown. */
     Kernel->object.type = gcvOBJ_UNKNOWN;
 
@@ -767,7 +774,7 @@ _AllocateMemory(
                     {
                         gckOS_Print("gpu virtual memory 0x%x cannot be allocated for external use !\n", physAddr);
 
-                        gcmkONERROR(gckVIDMEM_Free(node));
+                        gcmkONERROR(gckVIDMEM_Free(Kernel, node));
 
                         node = gcvNULL;
                     }
@@ -797,7 +804,8 @@ _AllocateMemory(
             if (gcmIS_SUCCESS(status))
             {
                 /* Allocate memory. */
-                status = gckVIDMEM_AllocateLinear(videoMemory,
+                status = gckVIDMEM_AllocateLinear(Kernel,
+                                                  videoMemory,
                                                   Bytes,
                                                   Alignment,
                                                   Type,
@@ -1251,7 +1259,7 @@ gckKERNEL_Dispatch(
 #endif
         /* Free video memory. */
         gcmkONERROR(
-            gckVIDMEM_Free(node));
+            gckVIDMEM_Free(Kernel, node));
 
         gcmkONERROR(
             gckKERNEL_RemoveProcessDB(Kernel,

drivers/mxc/gpu-viv/hal/kernel/gc_hal_kernel.h

@@ -453,6 +453,8 @@ struct _gckKERNEL
 #if gcdANDROID_NATIVE_FENCE_SYNC
     gctHANDLE                   timeline;
 #endif
+
+    gctPOINTER                  vidmemMutex;
 };
 
 struct _FrequencyHistory
@@ -766,9 +768,6 @@ typedef union _gcuVIDMEM_NODE
         /* Actual physical address */
         gctUINT32               addresses[gcdMAX_GPU_COUNT];
 
-        /* Mutex. */
-        gctPOINTER              mutex;
-
         /* Locked counter. */
         gctINT32                lockeds[gcdMAX_GPU_COUNT];
 
@@ -824,9 +823,6 @@ struct _gckVIDMEM
     /* Allocation threshold. */
     gctSIZE_T                   threshold;
 
-    /* The heap mutex. */
-    gctPOINTER                  mutex;
-
 #if gcdUSE_VIDMEM_PER_PID
     /* The Pid this VidMem belongs to. */
     gctUINT32                   pid;

drivers/mxc/gpu-viv/hal/kernel/gc_hal_kernel_command_vg.c

@@ -1060,6 +1060,7 @@ _AllocateLinear(
 
         /* Free the command buffer. */
         gcmkCHECK_STATUS(gckVIDMEM_Free(
+            Command->kernel->kernel,
             node
             ));
     }
@@ -1082,7 +1083,7 @@ _FreeLinear(
         gcmkERR_BREAK(gckVIDMEM_Unlock(Kernel->kernel, Node, gcvSURF_TYPE_UNKNOWN, gcvNULL));
 
         /* Free the linear buffer. */
-        gcmkERR_BREAK(gckVIDMEM_Free(Node));
+        gcmkERR_BREAK(gckVIDMEM_Free(Kernel->kernel, Node));
     }
     while (gcvFALSE);
 
@@ -1676,7 +1677,7 @@ _TaskFreeVideoMemory(
             = (gcsTASK_FREE_VIDEO_MEMORY_PTR) TaskHeader->task;
 
         /* Free video memory. */
-        gcmkERR_BREAK(gckVIDMEM_Free(gcmUINT64_TO_PTR(task->node)));
+        gcmkERR_BREAK(gckVIDMEM_Free(Command->kernel->kernel, gcmUINT64_TO_PTR(task->node)));
 
         /* Update the reference counter. */
         TaskHeader->container->referenceCount -= 1;

drivers/mxc/gpu-viv/hal/kernel/gc_hal_kernel_db.c

@@ -1199,7 +1199,7 @@ gckKERNEL_DestroyProcessDB(
         {
         case gcvDB_VIDEO_MEMORY:
             /* Free the video memory. */
-            status = gckVIDMEM_Free(gcmUINT64_TO_PTR(record->data));
+            status = gckVIDMEM_Free(Kernel, gcmUINT64_TO_PTR(record->data));
 
             gcmkTRACE_ZONE(gcvLEVEL_WARNING, gcvZONE_DATABASE,
                            "DB: VIDEO_MEMORY 0x%x (status=%d)",

drivers/mxc/gpu-viv/hal/kernel/gc_hal_kernel_event.c

@@ -2280,7 +2280,7 @@ gckEVENT_Notify(
 
                 /* Free video memory. */
                 status =
-                    gckVIDMEM_Free(node);
+                    gckVIDMEM_Free(Event->kernel, node);
 
                 break;
 

drivers/mxc/gpu-viv/hal/kernel/gc_hal_kernel_vg.c

@@ -306,7 +306,8 @@ gckKERNEL_AllocateLinearMemory(
             if (status == gcvSTATUS_OK)
             {
                 /* Allocate memory. */
-                status = gckVIDMEM_AllocateLinear(videoMemory,
+                status = gckVIDMEM_AllocateLinear(Kernel,
+                                                  videoMemory,
                                                   Bytes,
                                                   Alignment,
                                                   Type,
@@ -597,7 +598,7 @@ gceSTATUS gckVGKERNEL_Dispatch(
 #endif /* __QNXNTO__ */
 
         /* Free video memory. */
-        gcmkERR_BREAK(gckVIDMEM_Free(
+        gcmkERR_BREAK(gckVIDMEM_Free(Kernel,
             node
             ));